Mike wrote:
I am almost ready to start winding toroids for my K2. I have run into this
question before but never found an answer.
Suppose I wind a toroid, then check its inductance afterwards. I find that
the value is not exactly the same value as the schematic calls for, but after
removing one turn (or adding one turn), it's perfect.
Should you,
a) use the # of turns in the assembly instructions, regardless of the value
obtained, since the designer knows a lot more than I do
b) change the number of turns, since the performance of the radio is based
on the value of the inductance
The correct answer is a). One of the things the designer knows is that the
inductance of a toroid varies with frequency as a result of the characteristics
of the core material. So unless you are measuring the inductance at the
appropriate frequency, your measurement may not be correct.
--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco
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